Has a FIBA World Cup game ever ended 64-49?
Exactly once. On February 25, 2018, France beat Belgium 64-49, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 64-49 in league history.
That makes 64-49 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 65-49 has happened never and 64-50 has happened 2 times.